Screenwriter Simon Kinberg, who is working on both Fox franchises, tells THR "anything is possible."

The screenwriter behind Fox's X-Men: Days of Future Past and the studio's 2015 Fantastic Four reboot says he "would love to see" the superhero teams meet up in a crossover film, a la Marvel Studios' The Avengers.

"In the world of Marvel Studios and everything they're doing that we've been inspired by, anything is possible," Simon Kinberg tells The Hollywood Reporter. "I would say purely as a fan of comics and these film franchises, I would love to see it, but it has challenges."

He says there would be some major hurtles to overcome from a storytelling standpoint, particularly because neither franchise has acknowledged the existence of the other to date.

"The Fantastic Four live in a world where they are fantastic because they are the only people who have super powers. If they were to live in a world full of mutants, they would kind of just be four more mutants," he says. "In the X-Men movies, we have never acknowledged a public team of superheroes called the Fantastic Four who live in New York City, even though Charles' mansion is in Westchester, not so far form the city."

Fox already has a number of X-Men and Fantastic Four films planned, including Days of Future Past follow-up X-Men: Apocalypse (May 27, 2016); an untitled Wolverine film (March 3, 2017); Fantastic Four 2 (July 14, 2017); and a mystery Marvel film slated for July 13, 2018.